diff --git a/build-constraints.yaml b/build-constraints.yaml
index a1fededa..6f2153ba 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7848,6 +7848,8 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/6828
         - ascii-superset < 1.0.2.0
+        - ascii < 1.3
+        - ascii-th < 1.1
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of